干旱区生态环境知识资源中心(Arid): 基于稳定同位素技术的土壤碳循环研究进展

Arid

	基于稳定同位素技术的土壤碳循环研究进展
其他题名	Progress of research on soil carbon cycle using carbon isotope approach
	许文强; 陈曦; 罗格平; 冯异星
来源期刊	干旱区地理
ISSN	1000-6060
出版年	2014
卷号	37 期号:5 页码:980-987
中文摘要	植物和土壤是陆地生态系统的重要碳库，而碳同位素技术对各碳库中碳元素的迁移具有很好的指示作用，能够为碳转化研究提供有力证据。以往研究土壤碳循环主要是针对有机碳，较少考虑无机碳的作用，但干旱区土壤无机碳在区域碳循环过程中的贡献日益显著，因此干旱区土壤碳循环研究必须同时考虑土壤有机碳和无机碳的行为。基于碳稳定同位素技术的土壤有机碳循环研究和土壤无机碳动态及其碳同位素研究进展，探讨土壤无机碳与有机碳的转化关系，并对干旱区土壤碳循环研究进行展望，期望从稳定同位素生态学的角度探讨干旱区土壤有机碳和无机碳的转化关系，以推动干旱区土壤碳循环研究，揭示干旱区碳循环过程及其在全球碳循环中的作用。
英文摘要	Vegetation and soil carbon pools is important carbon pool of terrestrial ecosystem , which plays a crucial role in carbon biogeochemical cycle. The stable carbon isotope technique is one of the credible and effective techniques in ecological research,which can efficiently trace the dynamics of carbon transfer in ecological systems,and has been extensively applied in many fields of ecology. The previous study is emphasized in soil organic carbon cycle ,but soil inorganic cycle (pedogenic Carbonate carbnon) is usually neglected. However, soil inorganic carbon storage in arid region is huge and has significant contribution to region carbon cycle process. Therefore,the behaviors of soil organic carbon and inorganic carbon in the arid region must be considered in the soil carbon cycle study. In this paper, the applications of the stable carbon isotope technique in the researches of reconstruction of paleovege -tation, turnover of soil organic matter, soil inorganic carbon cycle, and interactions between soil organic and inorganic carbon transfer were briefly summarized,and the perspectives of the stable carbon isotope technique in arid region were also discussed, based on the issues existed in current researches. Moreover, some problems to be noted in particular: (1) the relative proportion of C3 and C4 plants in local biomass can be inferred from the 8 ~(13)C compositions of soil organic matter. The isotopic mass balance equation ware often applied to distinguish the relative proportion of C3 and C4 plants. However, some factors should be considered in the process of using the isotopic mass balance equation ,such as the temporal and spatial variability of vegetation succession pattern,the mixed distribution of C3 and C4 plants, changes in atmospheric CO_2 concentration,different decay rates of various components in organic matter, isotopic fractionation during decomposition of litter and vegetation. (2) Due to the 80% of the soil inorganic carbon storage in the soil below 1m in arid land, so sampling depth should be up to 3 m for estimation the soil inorganic carbon pool. Otherwise,it will cause the soil carbon pool estimation is low. Furthermore,soil CO2 flux can significant change the 8 ~(13)C value of soil inorganic carbon (pedogenic Carbonate). So the research of soil inorganic carbon cycle should more emphasis the role of soil CO2 flux. (3) Although soil organic carbon can transfer to inorganic carbon by soil physical,chemical and microbial action and soil parent materials weathering,but the actual number of sequestration atmospheric CO2 in the process of formation pedogenic carbonates was hard to assess it. So the study on soil carbon transfer should be strengthened in the future. The arid region is the ideal area for the research of soil organic carbon and inorganic carbon transfer. The following three questions will be the focus of future research : the effects of soil total carbon source/sink, soil pedogenic carbonate formation and soil carbon origin and turnover base on the stable carbon isotope method in arid region.
中文关键词	碳稳定同位素 ; C3和C_4植被 ; delta~(13)C富集 ; 发生性碳酸盐 ; 土壤CO_2
英文关键词	the stable carbon isotope C3 and C_4 vegetation delta _(13)C enrichment pedogenic carbonate soil CO_2
语种	中文
国家	中国
收录类别	CSCD
WOS类目	AGRICULTURE MULTIDISCIPLINARY
WOS研究方向	Agriculture
CSCD记录号	CSCD:5273350
来源机构	中国科学院新疆生态与地理研究所
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/231137
作者单位	中国科学院新疆生态与地理研究所, 荒漠与绿洲生态国家重点实验室, 乌鲁木齐, 新疆 830011, 中国
推荐引用方式 GB/T 7714	许文强,陈曦,罗格平,等. 基于稳定同位素技术的土壤碳循环研究进展[J]. 中国科学院新疆生态与地理研究所,2014,37(5):980-987.
APA	许文强,陈曦,罗格平,&冯异星.(2014).基于稳定同位素技术的土壤碳循环研究进展.干旱区地理,37(5),980-987.
MLA	许文强,et al."基于稳定同位素技术的土壤碳循环研究进展".干旱区地理 37.5(2014):980-987.